FEMA recommends the following steps to prevent 'significant radiation exposure,' which include "Try to maintain a distance of at least six feet between yourself and people who are not part of your household," and "If possible, wear a mask if you're sheltering with people who are not part of your household."
What's more, "If you are experiencing a medical emergency, call 9-1-1 and let the operator know if you have, or think you might have, Covid-19. If you can, put on a mask before help arrives."
"Many people already feel fear and anxiety about the coronavirus 2019 (COVID-19). The threat of nuclear explosion can add additional stress."